Estimation of extreme sea levels along the Bangladesh coast due to storm surge and sea level rise using EEMD and EVA

Extreme sea levels at the coast result from the combination of astronomical tides with atmospherically forced fluctuations at multiple time scales. Seiches, river floods, waves, inter-annual and inter-decadal dynamics and relative sea-level rise can also contribute to the total sea level. While tides are usually well described and predicted, the effect of the different atmospheric contributions to the sea level and their trends are still not well understood. Meso-scale atmospheric disturbances, synoptic-scale phenomena and planetary atmospheric waves (PAW) act at different temporal and spatial scales and thus generate sea-level disturbances at different frequencies. In this study, we analyze the 1872-2019 sea-level time series in Venice (northern Adriatic Sea, Italy) to investigate the relative role of the different driving factors in the extreme sea levels distribution. The adopted approach consists in 1) isolating the different contributions to the sea level by applying least-squares fitting and Fourier decomposition; 2) performing a multivariate statistical analysis which enables the dependencies among driving factors and their joint probability of occurrence to be described; 3) analyzing temporal changes in extreme sea levels and extrapolating possible future tendencies. The results highlight the fact that the most extreme sea levels are mainly dominated by the non-tidal residual, while the tide plays a secondary role. The non-tidal residual of the extreme sea levels is attributed mostly to PAW surge and storm surge, with the latter component becoming dominant for the most extreme events. The results of temporal evolution analysis confirm previous studies according to which the relative sea-level rise is the major driver of the increase in the frequency of floods in Venice over the last century. However, also long term variability in the storm activity impacted the frequency and intensity of extreme sea levels and have contributed to an increase of floods in Venice during the fall and winter months of the last three decades.

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High-Resolution Coastal Elevation Data: The Key to Planning for Storm Surge and Sea Level Rise

Geospatial Technologies and Homeland Security - The GeoJournal Library ◽

10.1007/978-1-4020-8507-9_11 ◽

2008 ◽

pp. 229-240

Author(s):

Mark Monmonier

Keyword(s):

High Resolution ◽

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Elevation Data ◽

And Sea Level

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FIELD OBSERVATIONS OF STORM SURGE DISASTER AND SEA LEVEL RISE DUE TO TYPHOON 9918 HITTING SHIRANUI TOWN, MATSUAI DISTRICT

PROCEEDINGS OF CIVIL ENGINEERING IN THE OCEAN ◽

10.2208/prooe.16.393 ◽

2000 ◽

Vol 16 ◽

pp. 393-398

Author(s):

Hideaki OKUZONO ◽

Noriko TAKAHASHI

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Field Observations ◽

Storm Surge Disaster ◽

And Sea Level

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Assessment of Damage and Adaptation Strategies for Structures and Infrastructure from Storm Surge and Sea Level Rise for a Coastal Community in Rhode Island, United States

Journal of Marine Science and Engineering ◽

10.3390/jmse4040067 ◽

2016 ◽

Vol 4 (4) ◽

pp. 67 ◽

Cited By ~ 3

Author(s):

Christopher Small ◽

Tyler Blanpied ◽

Alicia Kauffman ◽

Conor O’Neil ◽

Nicholas Proulx ◽

...

Keyword(s):

United States ◽

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Rhode Island ◽

Adaptation Strategies ◽

Coastal Community ◽

And Sea Level

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Joint effects of storm surge and sea-level rise on US Coasts: new economic estimates of impacts, adaptation, and benefits of mitigation policy

Climatic Change ◽

10.1007/s10584-014-1304-z ◽

2014 ◽

Vol 129 (1-2) ◽

pp. 337-349 ◽

Cited By ~ 62

Author(s):

James E. Neumann ◽

Kerry Emanuel ◽

Sai Ravela ◽

Lindsay Ludwig ◽

Paul Kirshen ◽

...

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Mitigation Policy ◽

Joint Effects ◽

And Sea Level

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Vulnerability of Hampton Roads, Virginia to Storm-Surge Flooding and Sea-Level Rise

Natural Hazards ◽

10.1007/s11069-006-0004-z ◽

2006 ◽

Vol 40 (1) ◽

pp. 43-70 ◽

Cited By ~ 126

Author(s):

Lisa R. Kleinosky ◽

Brent Yarnal ◽

Ann Fisher

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Hampton Roads ◽

Surge Flooding ◽

And Sea Level

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Investigation of Combined Storm Surge Inundation and Sea Level Rise to the New Bedford Hurricane Barrier

Ports 2016 ◽

10.1061/9780784479919.100 ◽

2016 ◽

Author(s):

Danielle Goudreau

Keyword(s):

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

And Sea Level

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Salt marsh resilience to sea-level rise and increased storm intensity

10.5194/egusphere-egu21-1294 ◽

2021 ◽

Author(s):

Natascia Pannozzo ◽

Nicoletta Leonardi ◽

Iacopo Carnacina ◽

Rachel Smedley

Keyword(s):

Salt Marsh ◽

Sea Level Rise ◽

Sea Level ◽

Storm Surge ◽

Salt Marshes ◽

Sediment Budget ◽

Geophysical Research ◽

Storm Intensity ◽

Combined Impact ◽

And Sea Level

Salt marshes are widely recognised as ecosystems with high economic and environmental value. However, it is still unclear how salt marshes will respond to the combined impact of future sea-level rise and possible increases in storm intensity (Schuerch et al. 2013). This study investigates marsh resilience under the combined impact of various storm surge and sea-level scenarios by using a sediment budget approach. The current paradigm is that a positive sediment budget supports the accretion of salt marshes and, therefore, its survival, while a negative sediment budget causes marsh degradation (Ganju et al. 2015). The Ribble Estuary, North-West England, was used as test case, and the hydrodynamic model Delft3D was used to simulate the response of the salt marsh system to the above scenarios. We conclude that the resilience of salt marshes and estuarine systems is enhanced under the effect of storm surges, as they promote flood dominance and trigger a net import of sediment.&#160; Conversely, sea-level rise threatens marsh stability, by promoting ebb dominance and triggering a net export of sediment. Ultimately, when storm surge and sea-level scenarios are combined, results show that storms with the highest intensities have the potential to counteract the negative impact of sea-level rise by masking its effects on the sediment budget.AcknowledgementsWe acknowledge the support of the School of Environmental Sciences, University of Liverpool.ReferencesGanju, N.K., Kirwan, M.L., Dickhudt, P.J., Guntenspergen, G.R., Cahoon, D.R. and Kroeger, K.D. 2015. &#8220;Sediment transport-based metrics of wetland stability&#8221;. Geophysical Research Letters, 42(19), 7992-8000.Schuerch, M., Vafeidis, A., Slawig, T. and Temmerman, S. 2013. &#8220;Modeling the influence of changing storm patterns on the ability of a salt marsh to keep pace with sea level rise&#8221;.&#160;Journal of Geophysical Research-Earth Surface, 118(1),&#160;84-96.

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